COMPONENTS FUNCTIONALITY OF THE EGR COMPONENTS Variable Pressure Output Device (VPOD) 12 V/24V power supply system DDEC IV ECM: PWM2 (Y1) EGR and PWM4 (X2) VNT Figure 2-4 EGR Valve and VNT Control System There are two Variable Pressure Output Devices (VPOD) that control the Variable Geometry Turbo (VNT) and the EGR system. The location of the VPODs is application dependent. During engine EGR operation, the VPOD provides modulated air pressure to the pneumatic actuators which change the VNT vanes and EGR valve positions. The VPOD interface with other systems may be viewed in see Figure 2-4. 2-4 All information subject to change without notice. (Rev.
April 2004) 7SE60 0404 Copyright © 2004 DETROIT DIESEL CORPORATION